-
1
-
-
0032544160
-
-
Singh S.B., Zink D.L., Williams M., Polishook J.D., Sanchez M., Silverman K.C., Lingham R.B. Bioorg. Med. Chem. Lett. 8:1998;2071-2076.
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Singh, S.B.1
Zink, D.L.2
Williams, M.3
Polishook, J.D.4
Sanchez, M.5
Silverman, K.C.6
Lingham, R.B.7
-
2
-
-
84992249712
-
-
50 values of 13 μM and >100 μM, respectively (Ref. 1)
-
50 values of 13 μM and >100 μM, respectively (Ref. 1).
-
-
-
-
3
-
-
0034026331
-
-
For recent excellent reviews on Ras farnesyltransferase as a novel cancer therapeutic target, see: (a) Nammi, S.; Lodagala, D. S. Acta Pharmacol. Sin. 2000, 21, 396-404; (b) End, D. W. Invest. New Drugs 1999, 17, 241-258; © Leonard, D. M.; Sebolt-Leopold, J. S. Drugs Future 1999, 24, 1099-1106; (d) Qian, Y.; Sebti, S. M.; Hamilton, A. D. Biopolymers 1997, 43, 25-41; (e) Sugita, K.; Ohtani, M. Curr. Pharm. Des. 1997, 3, 323-334; (f) Leonard, D. M. J. Med. Chem. 1997, 40, 2971-2990.
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Acta Pharmacol. Sin.
, vol.21
, pp. 396-404
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-
Nammi, S.1
Lodagala, D.S.2
-
4
-
-
0033375466
-
-
For recent excellent reviews on Ras farnesyltransferase as a novel cancer therapeutic target, see: (a) Nammi, S.; Lodagala, D. S. Acta Pharmacol. Sin. 2000, 21, 396-404; (b) End, D. W. Invest. New Drugs 1999, 17, 241-258; © Leonard, D. M.; Sebolt-Leopold, J. S. Drugs Future 1999, 24, 1099-1106; (d) Qian, Y.; Sebti, S. M.; Hamilton, A. D. Biopolymers 1997, 43, 25-41; (e) Sugita, K.; Ohtani, M. Curr. Pharm. Des. 1997, 3, 323-334; (f) Leonard, D. M. J. Med. Chem. 1997, 40, 2971-2990.
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(1999)
Invest. New Drugs
, vol.17
, pp. 241-258
-
-
End, D.W.1
-
5
-
-
0032696858
-
-
For recent excellent reviews on Ras farnesyltransferase as a novel cancer therapeutic target, see: (a) Nammi, S.; Lodagala, D. S. Acta Pharmacol. Sin. 2000, 21, 396-404; (b) End, D. W. Invest. New Drugs 1999, 17, 241-258; © Leonard, D. M.; Sebolt-Leopold, J. S. Drugs Future 1999, 24, 1099-1106; (d) Qian, Y.; Sebti, S. M.; Hamilton, A. D. Biopolymers 1997, 43, 25-41; (e) Sugita, K.; Ohtani, M. Curr. Pharm. Des. 1997, 3, 323-334; (f) Leonard, D. M. J. Med. Chem. 1997, 40, 2971-2990.
-
(1999)
Drugs Future
, vol.24
, pp. 1099-1106
-
-
Leonard, D.M.1
Sebolt-Leopold, J.S.2
-
6
-
-
0030612442
-
-
For recent excellent reviews on Ras farnesyltransferase as a novel cancer therapeutic target, see: (a) Nammi, S.; Lodagala, D. S. Acta Pharmacol. Sin. 2000, 21, 396-404; (b) End, D. W. Invest. New Drugs 1999, 17, 241-258; © Leonard, D. M.; Sebolt-Leopold, J. S. Drugs Future 1999, 24, 1099-1106; (d) Qian, Y.; Sebti, S. M.; Hamilton, A. D. Biopolymers 1997, 43, 25-41; (e) Sugita, K.; Ohtani, M. Curr. Pharm. Des. 1997, 3, 323-334; (f) Leonard, D. M. J. Med. Chem. 1997, 40, 2971-2990.
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(1997)
Biopolymers
, vol.43
, pp. 25-41
-
-
Qian, Y.1
Sebti, S.M.2
Hamilton, A.D.3
-
7
-
-
0030762376
-
-
For recent excellent reviews on Ras farnesyltransferase as a novel cancer therapeutic target, see: (a) Nammi, S.; Lodagala, D. S. Acta Pharmacol. Sin. 2000, 21, 396-404; (b) End, D. W. Invest. New Drugs 1999, 17, 241-258; © Leonard, D. M.; Sebolt-Leopold, J. S. Drugs Future 1999, 24, 1099-1106; (d) Qian, Y.; Sebti, S. M.; Hamilton, A. D. Biopolymers 1997, 43, 25-41; (e) Sugita, K.; Ohtani, M. Curr. Pharm. Des. 1997, 3, 323-334; (f) Leonard, D. M. J. Med. Chem. 1997, 40, 2971-2990.
-
(1997)
Curr. Pharm. Des.
, vol.3
, pp. 323-334
-
-
Sugita, K.1
Ohtani, M.2
-
8
-
-
0030865773
-
-
For recent excellent reviews on Ras farnesyltransferase as a novel cancer therapeutic target, see: (a) Nammi, S.; Lodagala, D. S. Acta Pharmacol. Sin. 2000, 21, 396-404; (b) End, D. W. Invest. New Drugs 1999, 17, 241-258; © Leonard, D. M.; Sebolt-Leopold, J. S. Drugs Future 1999, 24, 1099-1106; (d) Qian, Y.; Sebti, S. M.; Hamilton, A. D. Biopolymers 1997, 43, 25-41; (e) Sugita, K.; Ohtani, M. Curr. Pharm. Des. 1997, 3, 323-334; (f) Leonard, D. M. J. Med. Chem. 1997, 40, 2971-2990.
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(1997)
J. Med. Chem.
, vol.40
, pp. 2971-2990
-
-
Leonard, D.M.1
-
9
-
-
84992269472
-
-
The absolute configuration of 1 has not been discussed in the literature (Ref. 1)
-
The absolute configuration of 1 has not been discussed in the literature (Ref. 1).
-
-
-
-
10
-
-
0032777929
-
-
Recently, Jarvis et al. reported the isolation of structurally closely related antibiotic, memnobotrin A, from Memnoniella echinata organism, in which the γ-lactone ring (E ring) in 1 is only replaced by a γ-lactam ring, see: Hinkley S.F., Fettinger J.C., Dudley K., Jarvis B.B. J. Antibiot. 52:1999;988-997.
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(1999)
J. Antibiot.
, vol.52
, pp. 988-997
-
-
Hinkley, S.F.1
Fettinger, J.C.2
Dudley, K.3
Jarvis, B.B.4
-
11
-
-
0033985156
-
-
Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
-
(2000)
Eur. J. Org. Chem.
, pp. 297-302
-
-
Tsujimori, H.1
Bando, M.2
Mori, K.3
-
12
-
-
0034223055
-
-
Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
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(2000)
Biosci. Biotechnol. Biochem.
, vol.64
, pp. 1410-1415
-
-
Tsujimori, H.1
Mori, K.2
-
13
-
-
0035906053
-
-
Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
-
(2001)
Tetrahedron Lett.
, vol.42
, pp. 2389-2391
-
-
Maiti, S.1
Sengupta, S.2
Giri, C.3
Achari, B.4
Banerjee, A.K.5
-
14
-
-
0033601441
-
-
Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
-
(1999)
Tetrahedron
, vol.55
, pp. 15181-15208
-
-
Barrero, A.F.1
Alvarez-Manzaneda, E.J.2
Chahboun, R.3
Cortés, M.4
Armstrong, V.5
-
15
-
-
0033575715
-
-
Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
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(1999)
Bioorg. Med. Chem. Lett.
, vol.9
, pp. 2325-2328
-
-
Barrero, A.F.1
Alvarez-Manzaneda, E.J.2
Herrador, M.M.3
Chahboun, R.4
Galera, P.5
-
16
-
-
0030713075
-
-
Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
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(1997)
Tetrahedron Lett.
, vol.38
, pp. 7249-7252
-
-
Arjona, O.1
Garranzo, M.2
Mahugo, J.3
Maroto, E.4
Plumet, J.5
Sáez, B.6
-
17
-
-
0031592604
-
-
Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
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(1997)
Tetrahedron Lett.
, vol.38
, pp. 2325-2328
-
-
Barrero, A.F.1
Alvarez-Manzaneda, E.J.2
Chahboun, R.3
-
18
-
-
0035961043
-
-
Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
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(2001)
Org. Lett.
, vol.3
, pp. 4291-4294
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Takao, K.1
Sasaki, T.2
Kozaki, T.3
Yanagisawa, Y.4
Tadano, K.5
Kawashima, A.6
Shinonaga, H.7
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19
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0002701930
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Conjugate Additions of Reactive Carbanions to Activated Alkenes and Alkynes
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B.M. Trost, & I. Fleming. Oxford: Pergamon Press
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For a review, see: Lee V.J. Conjugate Additions of Reactive Carbanions to Activated Alkenes and Alkynes. Trost B.M., Fleming I., Comprehensive Organic Synthesis. 4:1991;69-138 Pergamon Press, Oxford.
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Comprehensive Organic Synthesis
, vol.4
, pp. 69-138
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Lee, V.J.1
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20
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0031585096
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While related conjugate addition reactions have been previously described in the literature, to our knowledge, the conjugate addition reaction between 10 and the Grignard reagent prepared from sterically hindered ortho-disubstituted bromobenzene derivative such as 14 is unprecedented, see: (a) Pemp, A.; Seifert, K. Tetrahedron Lett. 1997, 38, 2081-2084; (b) Mori, K.; Komatsu, M. Bull. Soc. Chim. Belg. 1986, 95, 771-781; © Welch, S. C.; Prakasa Rao, A. S. C. J. Org. Chem. 1978, 43, 1957-1961; (d) Welch, S. C.; Prakasa Rao, A. S. C. Tetrahedron Lett. 1977, 505-508; (e) Ireland, R. E.; Baldwin, S. W.; Welch, S. C. J. Am. Chem. Soc. 1973, 94, 2056-2066.
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Tetrahedron Lett.
, vol.38
, pp. 2081-2084
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Pemp, A.1
Seifert, K.2
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21
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0022994556
-
-
While related conjugate addition reactions have been previously described in the literature, to our knowledge, the conjugate addition reaction between 10 and the Grignard reagent prepared from sterically hindered ortho-disubstituted bromobenzene derivative such as 14 is unprecedented, see: (a) Pemp, A.; Seifert, K. Tetrahedron Lett. 1997, 38, 2081-2084; (b) Mori, K.; Komatsu, M. Bull. Soc. Chim. Belg. 1986, 95, 771-781; © Welch, S. C.; Prakasa Rao, A. S. C. J. Org. Chem. 1978, 43, 1957-1961; (d) Welch, S. C.; Prakasa Rao, A. S. C. Tetrahedron Lett. 1977, 505-508; (e) Ireland, R. E.; Baldwin, S. W.; Welch, S. C. J. Am. Chem. Soc. 1973, 94, 2056-2066.
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(1986)
Bull. Soc. Chim. Belg.
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Mori, K.1
Komatsu, M.2
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22
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0017886274
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While related conjugate addition reactions have been previously described in the literature, to our knowledge, the conjugate addition reaction between 10 and the Grignard reagent prepared from sterically hindered ortho-disubstituted bromobenzene derivative such as 14 is unprecedented, see: (a) Pemp, A.; Seifert, K. Tetrahedron Lett. 1997, 38, 2081-2084; (b) Mori, K.; Komatsu, M. Bull. Soc. Chim. Belg. 1986, 95, 771-781; © Welch, S. C.; Prakasa Rao, A. S. C. J. Org. Chem. 1978, 43, 1957-1961; (d) Welch, S. C.; Prakasa Rao, A. S. C. Tetrahedron Lett. 1977, 505-508; (e) Ireland, R. E.; Baldwin, S. W.; Welch, S. C. J. Am. Chem. Soc. 1973, 94, 2056-2066.
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, vol.43
, pp. 1957-1961
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Welch, S.C.1
Prakasa Rao, A.S.C.2
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23
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49349138101
-
-
While related conjugate addition reactions have been previously described in the literature, to our knowledge, the conjugate addition reaction between 10 and the Grignard reagent prepared from sterically hindered ortho-disubstituted bromobenzene derivative such as 14 is unprecedented, see: (a) Pemp, A.; Seifert, K. Tetrahedron Lett. 1997, 38, 2081-2084; (b) Mori, K.; Komatsu, M. Bull. Soc. Chim. Belg. 1986, 95, 771-781; © Welch, S. C.; Prakasa Rao, A. S. C. J. Org. Chem. 1978, 43, 1957-1961; (d) Welch, S. C.; Prakasa Rao, A. S. C. Tetrahedron Lett. 1977, 505-508; (e) Ireland, R. E.; Baldwin, S. W.; Welch, S. C. J. Am. Chem. Soc. 1973, 94, 2056-2066.
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(1977)
Tetrahedron Lett.
, pp. 505-508
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Prakasa Rao, A.S.C.2
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24
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0010733586
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While related conjugate addition reactions have been previously described in the literature, to our knowledge, the conjugate addition reaction between 10 and the Grignard reagent prepared from sterically hindered ortho-disubstituted bromobenzene derivative such as 14 is unprecedented, see: (a) Pemp, A.; Seifert, K. Tetrahedron Lett. 1997, 38, 2081-2084; (b) Mori, K.; Komatsu, M. Bull. Soc. Chim. Belg. 1986, 95, 771-781; © Welch, S. C.; Prakasa Rao, A. S. C. J. Org. Chem. 1978, 43, 1957-1961; (d) Welch, S. C.; Prakasa Rao, A. S. C. Tetrahedron Lett. 1977, 505-508; (e) Ireland, R. E.; Baldwin, S. W.; Welch, S. C. J. Am. Chem. Soc. 1973, 94, 2056-2066.
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(1973)
J. Am. Chem. Soc.
, vol.94
, pp. 2056-2066
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Ireland, R.E.1
Baldwin, S.W.2
Welch, S.C.3
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84992268801
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The high stereoselectivity observed for the α-hydroxylation of the ketone 5 leading to the α-hydroxyketone 6 can be accounted for by the assumption that the oxidizing reagent approaches from the less hindered α-face of the enolate generated from 5 under the influence of the axial juncture methyl group
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The high stereoselectivity observed for the α-hydroxylation of the ketone 5 leading to the α-hydroxyketone 6 can be accounted for by the assumption that the oxidizing reagent approaches from the less hindered α-face of the enolate generated from 5 under the influence of the axial juncture methyl group.
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33
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84992251485
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In general, the addition reaction of Grignard reagents to α,β-unsaturated ketones in the absence of copper salts affords 1,2-addition products. However, in this case the 1,4-addition product 15 was only obtained, and this is probably due to severe 1,3-diaxial interactions between the axial juncture methyl group in 10 and the incoming Grignard reagent of 14
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In general, the addition reaction of Grignard reagents to α,β-unsaturated ketones in the absence of copper salts affords 1,2-addition products. However, in this case the 1,4-addition product 15 was only obtained, and this is probably due to severe 1,3-diaxial interactions between the axial juncture methyl group in 10 and the incoming Grignard reagent of 14.
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84992230069
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2/-60°C→rt), the undesired C-7 epimer of 19 was exclusively produced in 86% yield. This stereochemical outcome can be rationalized by considering that the inner phenolic hydroxy group attacks the C-7 tertiary carbocation, in situ generated by acid treatment, from the less hindered α-face of the molecule under the influence of the β-oriented axial methyl group at the decalin junction
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2/-60°C→rt), the undesired C-7 epimer of 19 was exclusively produced in 86% yield. This stereochemical outcome can be rationalized by considering that the inner phenolic hydroxy group attacks the C-7 tertiary carbocation, in situ generated by acid treatment, from the less hindered α-face of the molecule under the influence of the β-oriented axial methyl group at the decalin junction.
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84992263295
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+)
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+).
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